20781470

素因数分解:

$2^1\times 5^1\times {\mathrm{31}}^1\times {\mathrm{43}}^1\times {\mathrm{1559}}^1$

素因数の和:1640

約数の個数: 32

約数和(自身を含む): 39536640

約数和(自身を除く): 18755170

約数列:

[1, 2, 5, 10, 31, 43, 62, 86, 155, 215, 310, 430, 1333, 1559, 2666, 3118, 6665, 7795, 13330, 15590, 48329, 67037, 96658, 134074, 241645, 335185, 483290, 670370, 2078147, 4156294, 10390735, 20781470]

約数ペア:

[(1, 20781470), (2, 10390735), (5, 4156294), (10, 2078147), (31, 670370), (43, 483290), (62, 335185), (86, 241645), (155, 134074), (215, 96658), (310, 67037), (430, 48329), (1333, 15590), (1559, 13330), (2666, 7795), (3118, 6665)]